Prepared roofing material



AApril 14, 1931. E. L.. CHAMBERLAIN PREPARED ROOFING- MATERIAL Filed June 18. 1928 trama Api. 14. 1931l UNITED STATES PATENT oFFlca L. GHAIBEBLAIN, l NOB'WOOD, MASSACHUSETTS, ASBIGNOR T0 BIRD & SON, INU.,

I' EAST WALPOLE. MASSACHUSETTS, A CORPORATION 0F MASSACHUSETTS PREPARED BOOFING MATERIAL application' mea :une 1s, 192s. semi No. 286,200.

This invention relates to improvements 'm" what is known as prepared roong material and has for its object to provide a novel, attractive and more durab e material. of this 5 character, and may be made either 1n the form of rolled roofing or as individual or strip shingles. 4 In the drawings Fig. 1 shows in plan a portion of the roofing llrliaterial as made in the form of rolled roo Fig.g2 shows a cross-section of the same;

Fig. 3 shows in rspective an mdivldual shingle of a mod' ed type involving additional layers; and

Fig. 4 shows a cross-section of the shingle shown in Fig. 3.

The roofing material and shingle shown 1n the drawings are of an improved tytpe of composition made up of a wool or rag elt orv any other fibrous material saturated in a bituminous compound or any other waterproofing material which penetrates into and through the same so as to render it water resistant. The base may also be a plastic or metallic-in character or a sheet of any suitable material having the desired characteristics. It has long been common to aplply to such bases additional asphalt or ot er coating material and deposit thereon a granular substance such as crushed slate. When, however, the art has attem ted to build up the thickness'of the shing es or roofing, especially at the butts of shin les, there has been a marked tendency for t e upper portion to slide, and what is called alligator, when ex osed on the roof. The sliding is commonly ue to the use of too soft an asphalt coating or too great a thickness of the coating material and when, in an effort to obviate this, a harder asphalt has been used, it has tended to check, crack or open in fissures, giving the so-called alitor appearance. Naturally, a material 1 aving the alligator appearance, besides bein unsi htly, 1s not as durable, as the sunlig t an moisture has a chance to penetrate in the cracks or fissures and the roofing is more readily attacked by the elements.

This invention has particularly to do with Y. so the provision of a thick roofing materialthe surfacevof which has no appreciable tendency to 'slide or alligator, and this result .is achieved by introducing into the asphalt coating which receives the granular mineral matter or crushed slate, a suitable quantity of asbestos or other similar fibre, the introduction of which minimizes or prevents sliding and aligatoring when used with a suitable bituminous material or other coating.

It was found that when asbestos was mixed with asphalt, the latter became more pliable and more adhesive, especially at low temperatures. For smooth surfaced roll roohngs this results in an unsually pliable sheet and for slate surfaced roofings and shingles, it not only adds to the pliability but decreases the tendency toshatter at low temperatures.

Referring to the drawings, and particularly Figs. l and 2, 2 indicates a lower or base layer of saturated felt or other ibrous material, and 4 a coating thereon of asphalt-asbestos mixture which in its preferred form consists of from 90 to 95 parts of 18 to 20 penetration, 210 F. to 215 F. melting point asphalt, and 5 to 10 parts by Weight of asbestos fibre. The asphaltic material, however, may vary from 7 5 to 99% with a penetration ranging from 16 to 30 with a melting point variation from 180 F. to 225 F. and the quantity of asbestos may range from 1% to 25%. Upon this layer of asphalt-asbestos compound is placed a surfacing layer of crushed slate or other suitable granular material which is rolled so as to cause the asphalt asbestos compound to Well up into the interstices and hold the material firmly. In practice I have found that the asphalt-asbestos compound gives a superior binding to crushed slate as compared with the ordinary bituminous binders heretofore employed.

Referring to Figs. 3 and 4, which show an individual shingle, 2 indicates the sami-ated felt as before; 5 a surface layer 4of binder which is preferably asphalt-asbestos compound, but may be of ordinary asphalt; 6 a a.y

`layer of granular material placed thereon.

7 a layer of asphalt-asbestos compound; and 8 a vsecond layer of crushed slate. It will be noted that the second layer of crushed slate and its binder of asphalt-asbestos compound 1110 has been carried over but a partn of the lower or butt end of the original shingle. Inv this way the shingles are provided with a thickened butt which gives the desired appearance 5 or shadow effect on` the roof, andthe exposed portions of the shingles are rendered more durable so as to-better resist the elements.

Having described my invention, what l wish to claiml and secure by Letters Patent is e l. As a new article of manufacture a roofing sheet comprising a base layer having a coating layer thereon consisting of amajor portion of bituminous material mixed with a minor portion of inert material and 'a surface layer of granular mineral matter held to said sheet by said coating. 2. As a new article of manufacture a roofing material comprising a sheet of suitable material as a base therefor, a bituminous coating thereon including asbestos ber intermixed with the same, said coating including a major portion of asphaltic material and a minor portion of the asbestos ber and a surfacing of granular mineral matter pari tially embedded in said bituminous coating.

3. As a new article of manufacture, a roofing material comprising a felt base saturated with a bituminous compound, a bitumif nous coating thereon including asbestos ber intermiXed with the same, said coating including a major portion of asphaltic material and a minor portion of the asbestos ber and a surface of granular mineral, matter par-v tiallyl embedded in said bituminous coating.

4. As a new article of manufacture a roof- -ing material comprising a sheet of suitable material, as a base therefor, a bituminous coating thereon, a layer of granular material, an additional coating of bituminous compound thereon including asbestos ber intermixed with the same, -said coating including a major portion of asphaltic material and a minor portion of the asbestos ber and an additional surface coating of granular mineral matter partially vembedded in said bituminous-coating.

5. As a new article of manufacture, a roofing material comprising a felt base saturated with .a bituminous compound, a bituminous coating thereon, a layer of granular mineral 'p matter, Van additional coating of bituminous compound thereon including asbestos; ber intermixed with the same, said coating ini5` cluding a major portion of asphaltic materialv and a minor portion of the asbestos ber and anadditional surfacecoating of granular mineral matter partially embedded in said bituminous coating.

et ELI L. CHAMBERLAIN. 

